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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cae111eda0629102b016dd24aa61afff20bf371b8ec3ded49ca3385efcbff7' 
  AND token = '8bG5XBFrL87/P2rSR1sx62WvVE3mtebnOE9Y3v1JQOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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