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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b63892103de5163e613b23165b5fdba3ac9ab9683258ca5a299882ccab51b15' 
  AND token = 'xj8NHJtiy7d015/0YbummCxorIazmwc24cNwOR6mFJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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