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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f04f8c1110e5b5c1ca5e181b98cf7e354ee498b4441840387da872961e2bb8' 
  AND token = 'QvCNZVNUXvOTXiWJMNadbOhPTbgO5IYawNiyeG96QfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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