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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2fa6c8ef2e7fb8a45fb09bc92d16a6410168cec87c1597b7ffda2ac98a9c10' 
  AND token = '7xfbi0IQZkigI3BIwTfUK7dGA2o7yC1BQeyKvYdwF6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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