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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62877cf8e9b38dd739c2d16edd51921e4e34eb54f612b1b4dda3fd0987f96782' 
  AND token = '6mGkPmeyF7PZ0k3yFmG7TlzhAysLO5vdkmQqfIB/J+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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