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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8d92dcd99e57e27ee3c454dc9c52cf2fd393a71397e6d59aafe77d63b59f09' 
  AND token = '3m32XIX+yx6oFn2zss07Jlb3Btp4yYAi+eO8v4yGw/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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