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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a981d820e66a63777a7bcd4cc0405b73e248edf194ed1de914ba84390b37249' 
  AND token = '5sPKmnC6HrpK2C2qu4YiJ2WkGTr2GE7J27UqlX7KEvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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