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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a898fb6689636634c481f88d083cda73c494e0b54a6f607009fe3cd66c6e06' 
  AND token = 'vkbHS6NDk3tjZladcbd6etCuATRZQu3c1XvCHE17W7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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