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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364755a6bf1c35e6a079ca6861366e492d7c1907d073c3d5391641836ea86840' 
  AND token = 'OQXln64vlXInnQYVSR7GSXqueWE3nae44ZLH3Zddh98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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