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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bfc70cd5dd899501629e328cd843983bc24b05bbff306dc5de734cee7e0be0' 
  AND token = '0qXrLrSlmtdEh5iCCltRFJKMuC96aBNP8hb3uD9IvHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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