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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cedc19e47a37ec8d68892ef0ea4b6a5123176a51c6b8e32d5d1745dee0faa56' 
  AND token = '8kc9qLu3fOuAA5tY8yw4g5ytokjTbCNyjgLKh2An5MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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