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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e4377d6c5c2895569bde852bfc60860e48491d53faa24aa70b2e6c509d1e16' 
  AND token = '29m7MaDWC7P64oNZ7VPdjxNSNtc8PATLbGVkeBx520A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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