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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbb9827b4b69329eac81c2406d11474ae229566248937969306c2c31a50cba6' 
  AND token = 'o+pLKvgQQ5Lhp6O49Ky5CRJk+42GO/888nmn4Pv6+1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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