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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d62fae638e3123e9e33f2ae11255e50180a17d40da639fb9935a1bcec1aaef' 
  AND token = '0cQshWqdrIt7PvSNZtiSvP8pUS91tuaQoohFrk15GhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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