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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc4288b27ea332517b417fcd760e0c5f7382a784de6fd833db88fd9dc1925a4' 
  AND token = 'BpI6NDErP4CbEMC1MziAoj2ewLGUMXsvVklyPlD5cUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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