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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3ef4e3bb3ad63344cb36dc238f831c6a962f5e395137c6221a2be34cd51510' 
  AND token = 'wOI/vKYDKDQ0+tx223SRvYC3aApE9VyECmWXkiBNZ6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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