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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638d2f8b76087b429549dc168ec913b59157c699c0f5732ead2711371664fded' 
  AND token = 'VWM3j2dSVrHydVsW6s+1m0Q5gDny76VTAEO3vYTfvkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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