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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c13eda2860e26f035f7efe26ceebb2e48784774a9ced798dbebacea5274fff9' 
  AND token = 'DNMvmTvcW+/VyV4hrbljgX6HNxp4Srb4/Uo+tzxRFSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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