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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fff01ded790b711814371e0a9831b114f16c90289ced3c23c13988cb98adaeb' 
  AND token = 'zBK3hmPy0FlTJzX1sI3heC3KyQ7z98bm9QLNwjUxliY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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