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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0631d524a0fb569b84d20360becd207215687591d4207dd6debadabf1b88f6' 
  AND token = 'ZZuiUqp2fciS3wIudUtON8da7jszlhWMQzmA/BlMxws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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