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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4eb63a5a58d7458d42a3b31704439fb8a2b7aa66668d924922b789a1f08b2ac' 
  AND token = 'Qg8WAMGH/Y8rV0tYTg+x3pXZ80J9FBD/uepwT42o4Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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