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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471de35ad44b21faf9fcf41563d6f0f7618e890c77416ff9ead8634ea61bff9f' 
  AND token = 'ihRsWjzKlVWx2lFdqlRHmMS40baaWSNBu43lD6Hy5gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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