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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50f885417a6f6dc0f00a9422466fb88f20fe8427acfc167ea60fabef5d94b94' 
  AND token = '0RnY5+2FeNXGb609HSHQSfNjrcq7kaE5kqcRKKiQqUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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