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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de00895c0b5b0791b382dd54b5087da66d050f4ce8caaf1f2652fe8ff99d16f1' 
  AND token = 'NpqR79h4a9MepMfdCAdGjoUf6WsdUXC8lrYhH+s3jFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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