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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c0c5a197ab4bde1d5b544ac78261c3612737e8fc8e00a4b2e31b1c5f6832c7' 
  AND token = 'hO7oAOuI+O3xyl3vrlV0tysIcd71Sklm2vAw9sdAJM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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