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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbf78ba75e2a3556831555060b730d3ae77957358671e95239ce3071b057cf7' 
  AND token = 'nURTmBWN3+mpu0NbMlDP6sJhBXC8WNobUa/XrVhRrag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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