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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e3be20346a1697df25b4f6849da7a3c95486ddeff3ad3a2f2fb07339e3092c' 
  AND token = 'VofS57GwUvOSAyOvytBwxkkJDO7//xUHlW/0CzUqo50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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