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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c7407227c2026a44a776893707453f142177c84357f6247c7e73db50570efe' 
  AND token = 'EUffaNFE/Cn+aEqCie6+RevTeJZNFeVxJXM+9bvpcnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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