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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cca6a8798890a71e83bd33bf04e5d40d5c8ee169373fed53633c6dc785a2f7' 
  AND token = 'G+mm57boqCwJMb1F/Dm4UFUwznKisWU5gowC4M0vdNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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