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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edc8669b1b0a779023429a63313586a925db232cec448774142c2b15ef812ff' 
  AND token = 'dNKpayDLUNTahLkgQlrYhGwl7kYdB1Tbwvhk2SsEm50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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