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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c863cbf6fa1ea2b48b8f7d49bfb7cb98d65a33079135ecc00af51b75708a93' 
  AND token = 'ecrfY7YpBZVPVpJXbfb8R8Wyud8uL2RL9KTmizDjpww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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