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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f30a948fe7859171d27d43246490e02db0058791c6baec226228a128c31297e' 
  AND token = 'kyKw602l4U6645HShmRrbf8K5MEvYEGqHLAuq3FSApY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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