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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ce83eef17a759b3590d9eb31e78d260c5f42d938c0b4651035c55e527a0a66' 
  AND token = 'Bh5kCXiG+CgQl8D7hTu92ZCGfi5DOfZ3+Y1+qkl286Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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