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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd02a5baf0ae71fcb0d7b62648c2f1f63fa602e92a0b9336c2ebfc1006cafbae' 
  AND token = 'Fw/q6ndHY0rQI2jSEXs6xOfddZ7n1OfZ3GoPC28vSpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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