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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14256a9ad1d98a1c192f441c8bd49a9298f70fd9f5f49cf1d84a4a21e731b2c' 
  AND token = 'Nih7QAHjzrBD4TAflobBPL08yd2wtk+N/0RvY4xkyKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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