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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06862c1a2a61dbaefea8d3e6fdc3a36d6bb6b957a8c8e17574bff5fb86ac71f8' 
  AND token = 'WrcREItRuixWUqfkmF96M31qCnZgmPRuMdNV5QfHYAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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