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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dc5c14e2a3e44332078210176e49309ad7b70aaa38c8c59d6b09260f8b657c' 
  AND token = 'x84YE4eR//Y/5zJDZgQrAN1/mj2w002p3aGpGMIpXFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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