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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e850795ca98b6654ed070c1a33107654dea525c3cb194d79162c24611cd83e' 
  AND token = 'QtnZn1Pw3z3TzIIZW/pNxbc32LhBWC+roEOgi/RMJeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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