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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cc4342a334fcb72321432326d7ea5c9089094b493046c55db244fc5fb09d77' 
  AND token = 'PjQruV4htM9x96h1aKCbE0T6n6Z4DO/UKxu0Yho5DnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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