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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a09db2a6e265608c0479a8bbec0007d08257bf66b37f10c8ed78dda0a09efb7' 
  AND token = 'DtMCdBrHkpsAnPo+7J3mke7vE9QzPV67BG4AIEstb0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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