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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa827486922c416e59e5601df5c47bae2b4127df8205dd2d234543b6102af8e' 
  AND token = 'Z2VphYs0VjJrJGjFLV3HHOiD1VY8O2u+RU4g20Uu36E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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