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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c19bbc576a1f15c81340aafc6c11eb23af9f987de655b769c344fb1e7e61ef' 
  AND token = 'njUELzN4RbQDwojf79DS+pXfc4ljrbRmHbSdXRVOng8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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