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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbcba67c7dcfa84c3cf8f91913698a1bcb35604fb31b75d5794c0992ee25ee1' 
  AND token = 'o7DnxEGE4Cro1UxeRgSBRVa4jfTSpQ9UAkzWM3tZ23g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}