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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e3c025fad214764aebad25684a7a617e14ea1218c7d8954953692386f48f63' 
  AND token = 'zhSwjV1D/iVy94PtN3l6M4lxTMUcU+TifA+u78z2gOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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