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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3771335cf6cf15935ca1f5f82ef7ff3d8a467cb1b52555b43960c863091e1a2' 
  AND token = 'gWrXeeZioQkS4J2zFhsHhga3275UWGPNZWuigNStOKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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