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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40a47c1018e5c4823c90c40a6ccb9c834c7f3a0042f81579b1567575f5c737d' 
  AND token = 'EXeHMtXWrUXB4GWR/+NNP3U3wNeKEF0NKNhyDGg/bco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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