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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9535dd3a0b6181c842ddb2c79ea02e6d25ddc8574aa14fdfad429a00144707d' 
  AND token = 'GfErB94zIUMDCrK7cOYe7tbVwOxaCEz/x487QjMdW7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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