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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62545f96a911c374c5afb4284482dc8793a93ac5a50d66089f95e4c4a9e562a' 
  AND token = '6yfGLRReN6/Hby7dHhG+579TlB05TaVkN33i6wQjcvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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