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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a309c76425d5655a8e2d683a41e1bc43f13ada1b1506156d769da07d6547d6' 
  AND token = '72ZFNZb2edNzG1tPM0KO6pA8v5N6ffAFZcPhrFTXyCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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