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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39b4e3f910170a46bf39cc743d5e811fa65145424fb6c447a79f0f15445f2f1' 
  AND token = 'TyI4LLTBtqQM4Dr4LoYHUespX1OqcA9xHvlwrGyxWMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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