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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb3fe014feb2682921b3e97e64e75fdad0d2edf3e22853d6c7b5a19813e4961' 
  AND token = 'lDj2CEQpXomz8eb7dTTme61CTfipgCdWey1oW4ou/bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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