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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de56deb9c75fb74d7282945a07ab62cff6c55014154434cd457cc5304cccc3e' 
  AND token = 'Fm+fTkyKExb6ANKhYVXv3Gn3ni0AERXy+kyl+DKJW1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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