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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6430950e86d63ffd9a1094d40e78192a80daee4f4841975bec59425c7895f616' 
  AND token = '9TD8xxhtj+PJ2a4ySZU45mZ1NLyCQ1diMPRBwkESXm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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