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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58098aa65f7ab434b062a99af07d92069850db7dd384c26c97e6887140480893' 
  AND token = '71DDIr0ufUn+j7A+aMX2mrDRG2ACK0dwBcunNMbsFnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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