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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac260d688482d7217bcfce97615f6db93d76c9094921f64997a9b07103c00b0' 
  AND token = 'xYK8+pKhwOgUUIbpb9kdDp698mF8cvj1osji7JTt9R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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