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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80cef47cc85abf0de78ee60d2c4c2566634b9a27e2e3405269d68008d4fdf35a' 
  AND token = 'X5WozzkfvHhWvXwvGLwXePgO+Q3NX4vfVjE3R43/CVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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