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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb0b23c2b7427b93d2ecdefc364ee82f9c74fc21f36319237f91c6ec9e0eb9c' 
  AND token = 'g32Va7rpTv8q0QrwSxR8Akp4I9sbwnXMlUUFYzu67Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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