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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244701c4959122ac2ae6a865b9bd6bc37fc0b12a9735e2d1f68d95dcc1d96f43' 
  AND token = '7cbKZNmwaD5lZPkxU7um9AE6FDmWkmHESgG/xzgL4ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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