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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb18eb5598889d84d5b3439067d77ad86014cf549b6741d916cccc738e26b851' 
  AND token = 'K31gxjYcw39rlGJV7VP7Dbdf0f/DYrkxEp2SS7XpKD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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