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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad3a3beaeacbae1965a4627c3e5d6c16ee476bbccd915ca90d384425f82b7a6' 
  AND token = 'y7l/hx/G3AqzL5TSdLUkguOKcouShG1i1fO8BcpDpq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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