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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431597b7ed80e576cd9edbc01b084d4ce1cdfb2d07726c8204ffc99d0e8b2c6a' 
  AND token = 'f0t7Z+bY1Dw86KJIvFTFlKtM4Fo7WOZMkcfcOu4EF6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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