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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5250a72372ad0e13933e70deba7c3b353aaef7986e1350d9ce2a51476f9453ea' 
  AND token = 'vAArigXdC/nmKoV9ZZzP+ah/J+XeR0qwJLebvYACcKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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