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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be23cc11ba8f0b9eea6efff2e40699be5f844d4b3f40aa693a4e4b99c84ed56e' 
  AND token = 'uo4qjGE64wqNBna4FIBp3R+I7ZZqm+RuO2OKXWO6sEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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