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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb6b33908582cf64a18cfa27daf94bc6e3ac9acf65196474ea79083604a8410' 
  AND token = 'BfrZ8aU2MqzCp3RDocGwJRbmwJLEPdzrbH+5o+jcYAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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