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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba86fcb24faceef29e2ce1d0bc0b3327275bf6a22f7403d92660d39905340b2' 
  AND token = 'bkz84120do71LXsIB04nBLM7PN4TsT8jIzL0qDdcKxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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