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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d4315b846571d6f7c1323afd1e21e5ad520c14b838bb6f5fb0fd4f099e4f55' 
  AND token = 'kPhUciBlqybr5oed6eENK8OkB2C1809enAZ+Sdg9FRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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