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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619e475cb47c4711c443bb666af57adc05a9c9a8702c5bf86ff44879a6958de5' 
  AND token = 'tt1n8zbqIPCb3bdD+RCWSmStMeIJ1OYZIvRCaVoHDmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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