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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312eb6c6ffb15dda62ec7352ba4f6695ba22290df877b49212ce7fcf9d97ea0f' 
  AND token = 'vNwNzNW2io1tZcTvu2QHVdBKhKwbuliJ0D+Ssa1WZZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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