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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bbbce410c84eb02b8e7519d448ee7b8f0a15030953114e2440ac1283fba1b3' 
  AND token = 'xVzoOc2xx6OTwwOLFRHgRyrJ0g5/PG5DvkopLTlGyNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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