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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd4589b52fb8c934fe84c4d58a51c6ea58e93e9fbfd908defcb37bfb3485fd7' 
  AND token = 'Dgf4D9y0pli/KPLakqNaJW76Do++/AlnWdExFaz0SiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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