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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9905dcaa110ebd1f2408f2a6fab3061c0789ff804377816d95365de25f529f' 
  AND token = 'M78M9av3aTkuuwObTRSfPJd5YhqG4LDCDSyD/8ICfx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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